too long

Is there an equivalent to ASP.NET routing in PHP. I am working on an online math dictionary in PHP and can't find any equivalent to ASP.NET routing for PHP. I want to be able to go to example.com/dictionary/word and have the word come up in a dynamically generated page from a database. I have been trying to figure out how to make a file similar to the global.asax file in php but can't find what I want. Any help would be great